Figure 14. The analog visual pain scale as recorded by the participants at home each day before heat (blue) and after heat but just before exercise (red). Each point is the mean of the group +/- the SD for the Heat group

From

Continuous Low Level Heat Wraps; Faster Healing and Pain Relief during Rehabilitation for Back, Knee and Neck Injuries

Jerrold Petrofsky, Michael Laymon, Faris Alshammari, Iman Akef Khowailed, Haneul Lee

World Journal of Preventive Medicine. 2015, 3(3), 61-72 doi:10.12691/jpm-3-3-3